Updated Gitignore + Added Practice Problem for Ch 11

.gitignore

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+.idea
+.idea/misc.xml
+c4t-java.iml
+.idea/misc.xml
+*.xml

src/com/codefortomorrow/intermediate/chapter11/practice/Average.java

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+package com.codefortomorrow.intermediate.chapter11.practice;
+
+public class Average {
+    /**
+     * Difficulty: 1
+     *
+     * Returns the average of two doubles
+     * @param a the first double
+     * @param b the second double
+     * @return average
+     */
+    public static double average(double a, double b) {
+        return 0.0; // TODO: Fix!
+    }
+}

src/com/codefortomorrow/intermediate/chapter11/practice/PrintEvens.java

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+package com.codefortomorrow.intermediate.chapter11.practice;
+
+public class PrintEvens {
+    /**
+     * Difficulty: 1
+     *
+     * Print the first n even integers
+     * (consider 0 an even number)
+     * @param n number of even integers to print
+     */
+    public static void printEvens(int n) {
+        // write code here
+    }
+}

src/com/codefortomorrow/intermediate/chapter11/solutions/Average.java

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+package com.codefortomorrow.intermediate.chapter11.solutions;
+
+public class Average {
+    /**
+     * Difficulty: 1
+     *
+     * Returns the average of two doubles
+     * @param a the first double
+     * @param b the second double
+     * @return average
+     */
+    public static double average(double a, double b) {
+        return (a + b) / 2;
+    }
+}

src/com/codefortomorrow/intermediate/chapter11/solutions/PrintEvens.java

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+package com.codefortomorrow.intermediate.chapter11.solutions;
+
+public class PrintEvens {
+    /**
+     * Difficulty: 2
+     *
+     * Print the first n even integers
+     * (consider 0 an even number)
+     * @param n number of even integers to print
+     */
+    public static void printEvens(int n) {
+        int evens = 0;
+        int i = 0;
+        while (evens < n) {
+            if (i % 2 == 0) {
+                System.out.print(i + " ");
+                evens++;
+            }
+            i++;
+        }
+    }
+}